python3-idna: upgrade 3.4 -> 3.6

python3-idna: upgrade 3.4 -> 3.6

License-Update:
===============
Update copyright date; Prep for 3.5; Update maintainer email

Changelog:
==========
-Fix regression to include tests in source distribution.
-Update to Unicode 15.1.0
-String codec name is now "idna2008" as overriding the system codec "idna" was
 not working.
-Fix typing error for codec encoding
-"setup.cfg" has been added for this release due to some downstream lack of
 adherence to PEP 517. Should be removed in a future release so please prepare
 accordingly.
-Removed reliance on a symlink for the "idna-data" tool to comport with PEP 517
 and the Python Packaging User Guide for sdist archives.
-Added security reporting protocol for project

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>